CVE-2024-35803

Boot-time crash via undersized EFI stub stack

Published May 17, 2024 · Updated May 11, 2026

Stack corruption in the Linux x86 EFI stub from 3.15 allows local users to crash the system during mixed-mode firmware boot. The 64-bit stub calls EFI boot services on the decompressor's fixed 16 KB stack instead of the firmware-provided stack, so overruns corrupt the adjacent .data section. Exploitation requires an x86 system booted through 32-bit EFI mixed mode and low-privilege local access; the bounded consequence is a boot-time system crash.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack corruption in the Linux x86 EFI stub from 3.15 allows local users to crash the system during mixed-mode firmware boot. The 64-bit stub calls EFI boot services on the decompressor's fixed 16 KB stack instead of the firmware-provided stack, so overruns corrupt the adjacent .data section. Exploitation requires an x86 system booted through 32-bit EFI mixed mode and low-privilege local access; the bounded consequence is a boot-time system crash.

The record

CVE
CVE-2024-35803
Published
May 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.15
  2. Affected versionversion=b8ff87a6158886771677e6dc8139bac6e3cba717 <2149f8a56e2ed345c7a4d022a79f6b8fc53ae926
  3. Affected versionversion=b8ff87a6158886771677e6dc8139bac6e3cba717 <725351c036452b7db5771a7bed783564bc4b99cc
  4. Affected versionversion=b8ff87a6158886771677e6dc8139bac6e3cba717 <930775060ca348b8665f60eef14b204172d14f31
  5. Affected versionversion=b8ff87a6158886771677e6dc8139bac6e3cba717 <cefcd4fe2e3aaf792c14c9e56dab89e3d7a65d02
  6. Affected versionversion=b8ff87a6158886771677e6dc8139bac6e3cba717 <fba7ee7187581b5bc222003e73e2592b398bb06d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.15; version=b8ff87a6158886771677e6dc8139bac6e3cba717 <2149f8a56e2ed345c7a4d022a79f6b8fc53ae926; version=b8ff87a6158886771677e6dc8139bac6e3cba717 <725351c036452b7db5771a7bed783564bc4b99cc; version=b8ff87a6158886771677e6dc8139bac6e3cba717 <930775060ca348b8665f60eef14b204172d14f31; version=b8ff87a6158886771677e6dc8139bac6e3cba717 <cefcd4fe2e3aaf792c14c9e56dab89e3d7a65d02; version=b8ff87a6158886771677e6dc8139bac6e3cba717 <fba7ee7187581b5bc222003e73e2592b398bb06d

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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